<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>sessionStorage</title>
</head>
<body>
    <h2>sessionStorage</h2>
    <button onclick="saveData()">点我保存一个数据</button>
    <button onclick="readData()">点我读取一个数据</button>
    <button onclick="deleteData()">点我删除一个数据</button>
    <button onclick="deleteAllData()">点我清空一个数据</button>

    <script>
        let p = {name:'张三',age:18}

        function saveData(){
            sessionStorage.setItem('msg','hello!!!')
            sessionStorage.setItem('msg2',666)
            sessionStorage.setItem('person',JSON.stringify(p))
        }

        function readData(){
            console.log("=============================")
            console.log(sessionStorage.getItem('msg'))
            console.log(sessionStorage.getItem('msg2'))
            const result  = sessionStorage.getItem('person')
            console.log(JSON.parse(result))
            console.log(sessionStorage.getItem('person'))
        }

        function deleteData(){
            sessionStorage.removeItem('msg2')
        }


        function deleteAllData(){
            sessionStorage.clear()
        }


    </script>
</body>
</html>